CN104343496B

CN104343496B - The failure detector of the blow-by gas returning apparatus of electromotor

Info

Publication number: CN104343496B
Application number: CN201410390272.7A
Authority: CN
Inventors: 吉冈卫
Original assignee: Aisan Industry Co Ltd
Current assignee: Aisan Industry Co Ltd
Priority date: 2013-08-09
Filing date: 2014-08-08
Publication date: 2016-11-23
Anticipated expiration: 2034-08-08
Also published as: JP6061812B2; US20150040878A1; CN104343496A; DE102014215470B4; DE102014215470A1; JP2015034524A; US9382824B2

Abstract

The present invention provides the failure detector of the blow-by gas returning apparatus of the electromotor of the fault that can effectively detect Pcv valve in the case of not increasing the special structure member for fault detect, not causing maximization and cost increase.Electromotor includes the EGR valve for regulating EGR gas flow.Blow-by gas return path makes this blow-by gas flow into pressurizer tank to make the blow-by gas produced within the engine be back to electromotor.Pcv valve is carried out action for the blow-by gas flow that adjusts in return path by negative pressure.At engine retard during fuel cut-off, air throttle is fixed as the small aperture of regulation by electronic-controlled installation (ECU), controlling EGR valve makes it open forcibly from valve closed mode, the negative pressure making the admission pressure in pressurizer tank changes, and judges that Pcv valve is whether as set fault according to the change of the air inflow detected by mass air flow sensor before and after making this negative pressure change.

Description

The failure detector of the blow-by gas returning apparatus of electromotor

Technical field

The present invention relates to the failure detector of a kind of blow-by gas returning apparatus, this blow-by gas Return mechanism makes the blow-by gas produced within the engine flow into intake channel and be back to electromotor, in detail Carefully say, relate to the failure detector of a kind of fault being configured to detect this return mechanism.

Background technology

In the past, as this technology, such as, the following blow-by gas described in patent documentation 1 it was known to Return mechanism.This return mechanism includes: blow-by gas return path, and it is located at the crankcase of electromotor Between the ratio air throttle of (or valve mechanism cover) and intake channel part downstream, Pcv valve, it sets In this return path, carried out action by negative pressure.Pcv valve utilize pressure that its entrance side is applied and Differential pressure between the pressure apply outlet side regulates aperture, adjusts in blow-by gas return path Gas flow.Here, produce negative pressure by electromotor when being operated in intake channel, comprise unburned The blow-by gas of propellant composition flows into intake channel via Pcv valve and blow-by gas return path, returns It is back to the combustor of electromotor.Utilizing this return, blow-by gas will not leak in air, with fuel Together it is used for burning and being processed.

Additionally, in the fault having a kind of blow-by gas returning apparatus described in following patent documentation 1 Detection device.This failure detector includes for detecting its gas pressure at blow-by gas return path The gas pressure sensor of power and judge that altering cylinder mixes according to the pressure detected by gas pressure sensor Close the electronic-controlled installation (ECU) of the fault of gas return path.

Prior art literature

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 10-184336 publication

Summary of the invention

The problem that invention is to be solved

But, in the failure detector described in patent documentation 1, logical owing to returning at blow-by gas Road is provided with the special gas pressure sensor of pressure for detecting blow-by gas, therefore, device Component parts increase gas pressure sensor, it is possible to cause larger-scale unit and cost increase.This Outward, in above-mentioned failure detector, although the gas that can detect in blow-by gas return path is let out Leakage, gas blocking, but fault cannot be detected for Pcv valve.Here, for the event detecting Pcv valve Barrier, it is considered to stop valve is newly set in blow-by gas return path and this stop valve is carried out opening and closing control System.But, in the case of being provided with stop valve, the component parts of device increases stop valve further, has Device may be caused to maximize further or cost increase.

The present invention completes the most in view of the foregoing, its object is to, it is provided that do not increasing for event Hinder the special-purpose member of detection, do not cause and maximize and can effectively detect PCV in the case of cost increase The failure detector of the blow-by gas returning apparatus of the electromotor of the fault of valve.

For solving the scheme of problem

In order to achieve the above object, the invention described in technical scheme 1 is the blow-by gas of a kind of electromotor The failure detector of return mechanism, its purport is, electromotor comprise combustor, intake channel, Exhaust channel, for combustor supply fuel fuel supplying part part, for regulation in intake channel The air inlet adjustable valve of the air inflow of flowing, is provided with the ratio air inlet for changing intake channel on the engine The admission pressure change parts of the admission pressure in adjustable valve part downstream, in order to detect electromotor Operating condition and detect in the part more by the upstream than air inlet adjustable valve of intake channel entering of flowing The air inflow detection part of tolerance, blow-by gas returning apparatus comprises to make to produce within the engine The blow-by gas that blow-by gas is back to electromotor and makes this blow-by gas flow into intake channel returns Return path, carried out by negative pressure for the blow-by gas flow that adjusts in blow-by gas return path The Pcv valve of action, the outlet of blow-by gas return path is connected to the ratio air inflow regulation of intake channel Valve part downstream, failure detector includes fault verification parts, when the deceleration of electromotor operates And be blocked utilize fuel supplying part part supply fuel time, these fault verification parts are by air inlet adjustable valve It is fixed as the small aperture of regulation, controls admission pressure change parts and make the ratio air inflow of intake channel adjust Admission pressure in joint valve part downstream changes, according to making this admission pressure change it Before and the change of air inflow that detected by air inflow detection part afterwards to judge Pcv valve whether as therefore Barrier.

Use foregoing invention structure, electromotor deceleration operate time and be to have blocked to utilize fuel to supply During parts supply fuel, becoming than the admission pressure in air inlet adjustable valve part downstream of intake channel For negative pressure.Thus, in the case of Pcv valve is normal, Pcv valve is carried out action by this negative pressure, according to The size of this negative pressure adjusts the blow-by gas flow in blow-by gas return path, alters cylinder according to this and mixes Closing throughput makes the air inflow in intake channel change.In contrast, break down in Pcv valve In the case of, even if the negative pressure in intake channel changes, blow-by gas flow also cannot be envisioned Change, the air inflow in intake channel cannot obtain anticipation change.Here, utilize breakdown determination portion Air inlet adjustable valve is fixed as the small aperture of regulation by part, controls admission pressure change parts and makes air inlet Changing than the admission pressure in air inlet adjustable valve part downstream of path, thus according at this The change of the air inflow that admission pressure is detected by air inflow detection part before and after changing comes Judge that Pcv valve is whether as fault.That is, depositing in varying situations in air inflow, Pcv valve can be according to negative The change of pressure carries out action as anticipation, it is possible to judge that this adjustment valve is normal.On the other hand, in air inlet In the case of amount is not changed in, Pcv valve carries out action, energy not according to the change of negative pressure as anticipation Enough judge that this adjustment valve is as fault.Here, due in order to detect the operating condition of electromotor and entering of arranging Tolerance detection part is used for judging the fault of Pcv valve, therefore, it is not necessary to arrange to detect fault specially Detection part.Additionally, hold concurrently by the application target for other being located at the auxiliary device of electromotor As admission pressure change parts, it is not necessary to arrange special admission pressure change parts.

In order to achieve the above object, according to the invention described in technical scheme 1, the invention described in technical scheme 2 Purport be, being additionally provided with admission pressure detection part on the engine, this admission pressure detection part is The operating condition of detection electromotor and detect intake channel than air inlet adjustable valve part downstream In admission pressure, electromotor deceleration operate time and be blocked utilize fuel supplying part part supply combustion During material, air inlet adjustable valve is fixed as the small aperture of regulation by fault verification parts, controls admission pressure Change parts and make occurring than the admission pressure in air inlet adjustable valve part downstream of intake channel Change, is detected by admission pressure detection part according to before and after making this admission pressure change The change of admission pressure judge that admission pressure change parts, whether as fault, is judging that admission pressure becomes When more parts are normal, examine by air inflow detection part according to before and after making admission pressure change The change of the air inflow measured is to judge that whether Pcv valve is as fault.

Use foregoing invention structure, in addition to the effect of the invention described in technical scheme 1, also have with Under such effect.That is, in the case of admission pressure change parts is normal, by controlling this parts, Occurring than as the admission pressure picture anticipation in air inlet adjustable valve part downstream of intake channel Change.Here, when utilizing fault verification parts judgement admission pressure change parts normal, according to entering The change of the air inflow that atmospheric pressure is detected by air inflow detection part before and after changing is sentenced Determine whether Pcv valve is fault.Thus, owing to judging premised on admission pressure change parts is normal The fault of Pcv valve, therefore, it is possible to carry out suitable judgement to fault.

In order to achieve the above object, according to the invention described in technical scheme 2, the invention described in technical scheme 3 Purport be, be additionally provided with another admission pressure change parts on the engine, this another admission pressure become More parts for changing the ratio admission pressure in air inlet adjustable valve part downstream of intake channel, When fault verification parts judge admission pressure change parts as fault, control another admission pressure change parts And make changing than the admission pressure in air inlet adjustable valve part downstream of intake channel, according to The air inflow detected by air inflow detection part before and after making this admission pressure change Change judges that Pcv valve is whether as fault.

Use foregoing invention structure, in addition to the effect of the invention described in technical scheme 2, also have with Under such effect.That is, it is the situation of fault in admission pressure change parts, even if controlling this parts, The change that cannot obtain anticipation than the admission pressure in air inlet adjustable valve part downstream of intake channel Change.Here, when utilizing fault verification parts to judge admission pressure change parts as fault, control another Admission pressure change parts and make intake channel than the air inlet in air inlet adjustable valve part downstream Pressure changes, and examines by air inflow detection part according to before and after changing at this admission pressure The change of the air inflow measured is to judge that whether Pcv valve is as fault.Thus, in admission pressure change parts In the case of fault, it is also possible to guarantee the chance of the fault verification of Pcv valve.Additionally, by will be for Other application target is located at the auxiliary device of electromotor and is also used as another admission pressure change parts, it is not necessary to Another special admission pressure change parts is set.

In order to achieve the above object, according to the invention described in technical scheme 1 or 2, described in technical scheme 4 The purport of invention is, is additionally provided with the aerofluxus for making spontaneous combustion room discharge to exhaust channel on the engine A part as exhaust gas recirculation gas flow into intake channel and be back to combustor exhaust gas recirculation path, For regulating the exhaust gas reflux valve of the flowing of the exhaust gas recirculation gas in exhaust gas recirculation path, admission pressure becomes More parts are exhaust gas reflux valves, electromotor deceleration operate time and be to have blocked to utilize fuel supplying part part During supply fuel, fault verification parts make it beat forcibly from valve closed mode by controlling exhaust gas reflux valve Open, make changing than the admission pressure in air inlet adjustable valve part downstream of intake channel.

Use the structure of foregoing invention, in addition to the effect of the invention described in technical scheme 1 or 2, by inciting somebody to action The exhaust gas reflux valve being located at electromotor for the purpose regulating exhaust gas recirculation gas flow is also used as air inlet pressure Power change parts, it is not necessary to special admission pressure change parts is set.

In order to achieve the above object, according to the invention described in technical scheme 1 or 2, described in technical scheme 5 Invention purport be, electromotor also comprise be respectively arranged on combustor and lead to intake channel air inlet and Lead to the air vent of exhaust channel, the inlet valve for opening and closing air inlet, the aerofluxus for opening and closing air vent The rotation of door and electromotor synchronously drives inlet valve and exhaust valve to make the valve train machine of its opening and closing Structure, the variable closing characteristic changeable mechanism of closing characteristic of at least one made in inlet valve and exhaust valve, Admission pressure change parts is closing characteristic changeable mechanism, electromotor deceleration operate time and be block When utilizing fuel supplying part part supply fuel, fault verification parts make closing characteristic changeable mechanism carry out action And make closing characteristic change so that intake channel than entering in air inlet adjustable valve part downstream Atmospheric pressure changes.

Use the structure of foregoing invention, in addition to the effect of the invention described in technical scheme 1 or 2, by inciting somebody to action The purpose variable for the closing characteristic of at least one made in inlet valve and exhaust valve is located at electromotor Closing characteristic changeable mechanism is also used as admission pressure change parts, it is not necessary to arrange special admission pressure change Parts.

In order to achieve the above object, according to the invention described in technical scheme 1 or 2, described in technical scheme 6 Invention purport be, be additionally provided with on the engine for intake channel than air inlet adjustable valve on the lower The part of trip imports the new conductance of new gas and enters path, enters the new gas of flowing in path for regulation in new conductance New conductance enter valve, admission pressure change parts is that new conductance enters valve, electromotor deceleration operate time and Be blocked utilize fuel supplying part part supply fuel time, fault verification parts by control new conductance enter valve Make it open forcibly from valve closed mode, make intake channel than air inlet adjustable valve part downstream In admission pressure change.

Use the structure of foregoing invention, in addition to the effect of the invention described in technical scheme 1 or 2, by inciting somebody to action The new conductance being located at electromotor to the purpose of the new conductance inbound traffics of intake channel importing for regulation enters valve Be also used as admission pressure change parts, it is not necessary to special admission pressure change parts is set.

In order to achieve the above object, according to the invention described in technical scheme 3, the invention described in technical scheme 7 Purport be, be additionally provided with for the aerofluxus making spontaneous combustion room discharge to exhaust channel on the engine Part as exhaust gas recirculation gas flow into intake channel and be back to combustor exhaust gas recirculation path, for The exhaust gas reflux valve of flowing of the exhaust gas recirculation gas in regulation exhaust gas recirculation path, electromotor also comprises point It is not located at combustor and leads to the air inlet of intake channel and lead to the air vent of exhaust channel, for opening and closing The inlet valve of air inlet, for the exhaust valve of opening and closing air vent and the rotation of electromotor synchronously drive into Valve and exhaust valve and make the valve actuating gear of its opening and closing, make at least one in inlet valve and exhaust valve The variable closing characteristic changeable mechanism of closing characteristic, admission pressure change parts is exhaust gas reflux valve, separately One admission pressure change parts is closing characteristic changeable mechanism, electromotor deceleration operate time and be block When utilizing fuel supplying part part supply fuel, fault verification parts by control exhaust gas reflux valve make its from Valve closed mode is opened forcibly, make intake channel than entering in air inlet adjustable valve part downstream Atmospheric pressure changes, and detects by admission pressure according to before and after making this admission pressure change The change of the admission pressure that parts detect is to judge that exhaust gas reflux valve, whether as fault, is judging that aerofluxus is returned When stream valve is fault, by making closing characteristic changeable mechanism carry out action, make the ratio air inflow of intake channel Admission pressure in regulation valve part downstream changes, according to making this admission pressure change Before and after the change of air inflow that detected by air inflow detection part to judge Pcv valve whether as Fault.

Use the structure of foregoing invention, when utilizing fault verification parts to judge, exhaust gas reflux valve is normal, root Change according to the air inflow detected by air inflow detection part before and after changing at admission pressure Change and judge that Pcv valve is whether as fault.Thus, due to premised on exhaust gas reflux valve is normal, i.e. air inlet The fault of Pcv valve is judged premised on changing as the anticipation of pressure picture, therefore, it is possible to fault Carry out suitable judgement.Additionally, when utilizing fault verification parts to judge exhaust gas reflux valve as fault, control Closing characteristic changeable mechanism processed and make intake channel than entering in air inlet adjustable valve part downstream Atmospheric pressure changes, according to before and after changing at this admission pressure by air inflow detection part The change of the air inflow detected is to judge that whether Pcv valve is as fault.Thus, it is event at exhaust gas reflux valve In the case of barrier, it is also possible to guarantee the chance of the fault verification of Pcv valve.Additionally, by by closing characteristic Changeable mechanism is also used as another admission pressure change parts, it is not necessary to arrange special another admission pressure change Parts.

In order to achieve the above object, according to the invention described in technical scheme 3, the invention described in technical scheme 8 Purport be, electromotor also comprises and is respectively arranged on combustor and leads to the air inlet of intake channel and lead to The air vent of exhaust channel, the inlet valve for opening and closing air inlet, the exhaust valve for opening and closing air vent, Rotation with electromotor synchronously drives inlet valve and exhaust valve to make the valve actuating gear of its opening and closing, make The closing characteristic changeable mechanism that the closing characteristic of at least one in inlet valve and exhaust valve is variable, is starting Machine is provided with for the new gas importing new gas than air inlet adjustable valve part downstream of intake channel The new conductance of the new gas import path, entering in path flowing for regulation in new conductance enters valve, admission pressure Change parts is that new conductance enters valve, and another admission pressure change parts is closing characteristic changeable mechanism, is sending out Motivation deceleration operating time and be blocked utilize fuel supplying part part supply fuel time, fault verification parts Entering valve by the new conductance of control makes it open forcibly from valve closed mode, makes the ratio air inflow of intake channel Admission pressure in regulation valve part downstream changes, according to making this admission pressure change Before and after the change of air inflow that detected by air inflow detection part to judge that new conductance enters valve and is No for fault, when judging that new conductance enters valve as fault, by making closing characteristic changeable mechanism carry out action, Make changing than the admission pressure in air inlet adjustable valve part downstream of intake channel, according to Make the change of the air inflow that this admission pressure detects before and after changing by air inflow detection part Change and judge that Pcv valve is whether as fault.

Use the structure of foregoing invention, judging that new conductance enters valve as time normal, send out according at admission pressure The change of the air inflow detected by air inflow detection part before and after changing is to judge Pcv valve Whether it is fault.Thus, due to by new conductance enter valve normal premised on, i.e. admission pressure picture anticipation that Sample judges the fault of Pcv valve premised on changing, therefore, it is possible to fault is carried out suitable judgement. When new conductance enters valve as fault utilizing fault verification parts to judge, control closing characteristic changeable mechanism and make Changing, according at this than the admission pressure in air inlet adjustable valve part downstream of intake channel The change of the air inflow that admission pressure is detected by air inflow detection part before and after changing is sentenced Determine whether Pcv valve is fault.Thus, enter in the case of valve is fault in new conductance, it is also possible to guarantee PCV The chance of the fault verification of valve.Additionally, by closing characteristic changeable mechanism is also used as another admission pressure Change parts, it is not necessary to another special admission pressure change parts is set.

The effect of invention

Use the invention described in technical scheme 1, do not increasing the special-purpose member for fault detect, do not drawing Act the fault maximizing and can effectively detecting Pcv valve in the case of cost increase.

Use the invention described in technical scheme 2, in addition to the effect of the invention described in technical scheme 1, also can Enough detect the fault of admission pressure change parts, it is possible to suitably Pcv valve is carried out fault detect.

Use the invention described in technical scheme 3, in addition to the effect of the invention described in technical scheme 2, entering In the case of atmospheric pressure units of variance is fault, it is also possible to the fault of detection Pcv valve, it is possible to more suitable Ground carries out the detection of this fault.

Use the invention described in technical scheme 4, do not increasing the special-purpose member for fault detect, do not drawing Act the fault maximizing and can effectively detecting Pcv valve in the case of cost increase.

Use the invention described in technical scheme 5, do not increasing the special-purpose member for fault detect, do not drawing Act the fault maximizing and can effectively detecting Pcv valve in the case of cost increase.

Use the invention described in technical scheme 6, do not increasing the special-purpose member for fault detect, do not drawing Act the fault maximizing and can effectively detecting Pcv valve in the case of cost increase.

Use the invention described in technical scheme 7, do not increasing the special-purpose member for fault detect, do not drawing Act the fault maximizing and can effectively detecting Pcv valve in the case of cost increase, and can be suitable Ground carries out this fault detect.It is further possible to the fault of detection exhaust gas reflux valve, at exhaust gas reflux valve it is In the case of fault, it is also possible to more suitably Pcv valve is carried out fault detect.

Use the invention described in technical scheme 8, in addition to the effect of the invention described in technical scheme 2, not Cause the fault maximizing and can effectively detecting Pcv valve in the case of cost increase, and can fit Locality carries out this fault detect.It is further possible to detect new conductance to enter the fault of valve, enter in this new conductance In the case of valve is fault, it is also possible to more suitably Pcv valve is carried out fault detect.

Accompanying drawing explanation

Fig. 1 relates to the 1st embodiment, is the gasoline engine system representing and comprising supercharger and EGR device Summary construction diagram.

Fig. 2 relates to the 1st embodiment, is to represent a part for EGR passage enlargedly and be provided with EGR valve The sectional view of part.

Fig. 3 relates to the 1st embodiment, and (a), (b) are the valve overlaps representing inlet valve and exhaust valve Schematic diagram.

Fig. 4 relates to the 1st embodiment, is the sectional view representing Pcv valve.

Fig. 5 relates to the 1st embodiment, is to represent the deceleration of electromotor and the stream of Pcv valve during fuel cut-off The chart of flow characteristic.

Fig. 6 relates to the 1st embodiment, is the flow chart of an example of the process content representing fault detect.

Fig. 7 relates to the 2nd embodiment, is the flow chart of an example of the process content representing fault detect.

Fig. 8 relates to the 3rd embodiment, is the flow chart of an example of the process content representing fault detect.

Fig. 9 relates to the 4th embodiment, is the flow chart of an example of the process content representing fault detect.

Figure 10 relates to the 5th embodiment, is the petrol engine system representing and comprising supercharger and EGR device The summary construction diagram of system.

Figure 11 relates to the 5th embodiment, is the flow chart of an example of the process content representing fault detect.

Detailed description of the invention

1st embodiment

Below, blow-by gas returning apparatus by the electromotor of the present invention is explained in detail with reference to the accompanying drawings The 1st embodiment that failure detector embodies.

Fig. 1 utilize summary construction diagram represent the supercharger and exhaust gas recirculation device comprising present embodiment The gasoline engine system of (EGR device).This engine system being mounted on automobile includes reciprocating Electromotor 1.Connecting on the air inlet 2 of electromotor 1 and have intake channel 3, connecting on air vent 4 has Exhaust channel 5.Entrance at intake channel 3 is provided with air filter 6.Ratio air filter at intake channel 3 Clear device 6 part downstream is provided with supercharger 7, and this supercharger 7 is at intake channel 3 and exhaust channel Air inlet boosting in the chien shih intake channel 3 of 5.

Supercharger 7 include being configured at intake channel 3 compressor 8, be configured at exhaust channel 5 turbine 9, So that the rotary shaft 10 of compressor 8 and turbine 9 can be linked in the way of rotating integrally.Supercharger 7 utilizes row In gas path 5, the aerofluxus of flowing makes turbine 9 rotate and make compressor 8 rotate integrally by rotary shaft 10, by This makes the air inlet in intake channel 3 boost, i.e. carries out supercharging.

Exhaust channel 5 is adjacent to supercharger 7 be provided with the discharge bypass path 11 walking around turbine 9.? This discharge bypass path 11 is provided with exhaust gas by-pass valve 12.By utilizing exhaust gas by-pass valve 12 to regulate in aerofluxus The aerofluxus of flowing in bypass path 11, regulates the extraction flow being supplied to turbine 9, regulates turbine 9 He The rotary speed of compressor 8, the boost pressure that regulation is produced by supercharger 7.

On intake channel 3, between the compressor 8 and electromotor 1 of supercharger 7, it is provided with intercooler 13.This intercooler 13 is for becoming the inlet gas cooling of high temperature to suitably by utilizing compressor 8 to boost Temperature.The part between intercooler 13 and electromotor 1 at intake channel 3 is provided with pressurizer tank 3a.Additionally, intake channel 3 ratio intercooler 13 downstream and more by the upstream than pressurizer tank 3a for portion It is arranged with the electronic throttle device 14 as DYN dynamic air throttle.Be equivalent to the air inflow regulation of the present invention The electronic throttle device 14 of one example of valve includes being configured at the air throttle 21 of the butterfly of intake channel 3, using In this air throttle 21 being carried out the stepping motor 22 of driven for opening and closing, for detecting the aperture of air throttle 21 The solar term sensor 23 of (solar term aperture) TA.Electronic throttle device 14 is configured to basis by driver to adding Operation that speed pedal 26 is carried out and utilize stepping motor 22 that air throttle 21 carries out driven for opening and closing, thus adjust The aperture of joint joint valve 21.As the structure of electronic throttle device 14, for instance, it is possible to use Japanese Unexamined Patent Publication The basic structure of " choking system " described in Fig. 1 and Fig. 2 of 2011-252482 publication.Additionally, in aerofluxus The ratio turbine 9 of path 5 part downstream is provided with catalytic converter 15, and this catalytic converter 15 is as being used for Purify the exhaust catalyst of aerofluxus.

Electromotor 1 is provided with and supplies the fuel injector 25 of fuel for spraying to combustor 16.From fuel Case (omitting diagram) supplies fuel to fuel injector 25.Fuel injector 25 is equivalent to the fuel supplying part of the present invention One example of part.Additionally, on electromotor 1, be provided with spark plug 29 accordingly with each cylinder.Each fire Flower plug 29 is carried out firing action by the high voltage of self-ignition device 30 output.High electricity according to lighter 30 Pressure output determines the ignition timing of each spark plug 29 opportunity.

In the present embodiment, the EGR device being used for realizing a large amount of EGR includes: exhaust gas recirculation path (EGR passage) 17, it is high-pressure-loop formula, logical to aerofluxus for making from the combustor 16 of electromotor 1 A part for the aerofluxus that road 5 is discharged flows into intake channel 3 as EGR gas and is back to combustor 16；With And exhaust gas reflux valve (EGR valve) 18, its in order to regulate the flowing of the EGR gas in EGR passage 17 and It is located at EGR passage 17.EGR passage 17 is located at ratio turbine 9 part by the upstream and the voltage stabilizing of exhaust channel 5 Between case 3a.That is, in order to make a part for the aerofluxus flowed in exhaust channel 5 as EGR gas warp Cross EGR passage 17 to flow into intake channel 3 and be back to combustor 16, the outlet 17a of EGR passage 17 with enter The ratio air throttle 21 of gas path 3 part downstream, i.e. pressurizer tank 3a connect.And, EGR passage 17 Entrance 17b and exhaust channel 5 ratio turbine 9 part by the upstream connect.

The EGR catalyzed conversion for purifying EGR gas it is provided with near the entrance 17b of EGR passage 17 Device 19.It addition, ratio EGR catalytic converter 19 part downstream of EGR passage 17 be provided with for It is cooled in this path 17 cooler for recycled exhaust gas 20 of the EGR gas of flowing.In the present embodiment, EGR Valve 18 is configured at the ratio cooler for recycled exhaust gas 20 of EGR passage 17 part downstream.

Fig. 2 utilize sectional view represent a part for EGR passage 17 enlargedly and be provided with EGR valve 18 Part.As shown in Figure 1 and Figure 2, EGR valve 18 is configured to promote valve and be configured to electrodynamic valve.That is, EGR Valve 18 includes by the spool 32 of DC motor 31 driven for opening and closing.Spool 32 is in roughly conical shape, with energy The mode enough falling to being located in EGR passage 17 valve seat 33 arranged is arranged.DC motor 31 includes with energy Enough ground of keeping straight on moves back and forth the output shaft 34 that the mode of (stroke movement) is constituted, on the top of this output shaft 34 End is fixed with spool 32.Output shaft 34 is supported on the housing constituting EGR passage 17 by bearing 35.And And, by making the output shaft 34 of DC motor 31 carry out stroke movement, it is possible to regulation spool 32 relative to The aperture of valve seat 33.The output shaft 34 of EGR valve 18 with from spool 32 dropping place in the full-shut position of valve seat 33 Stroke movement is carried out with the stroke L1 of regulation in the period of the full-gear being connected to bearing 35 to spool 32 Mode arrange.In the present embodiment, in order to realize a large amount of EGR, expansion compared with former technology The aperture area of valve seat 33.Combine with this, make spool 32 maximize.Knot as this EGR valve 18 Structure, such as, can use " EGR valve " described in Fig. 1 of Japanese Unexamined Patent Publication 2010-275941 publication Basic structure.

In the present embodiment, EGR valve 18 is equivalent to the example of admission pressure change parts of the present invention Son.That is, when electromotor 1 slows down operating, the ratio being changed intake channel 3 by EGR valve 18 opening and closing is saved Admission pressure PM in valve 21 part downstream, i.e. pressurizer tank 3a.

As it is shown in figure 1, be respectively provided with the air inlet of opening and closing air inlet 2 in cylinder head 1c of electromotor 1 Door 41, exhaust valve 42 for opening and closing air vent 4.Inlet valve 41 and exhaust valve 42 are configured to be utilized respectively The rotation of different camshafts 43,44 and carry out action.It is respectively equipped with on the top of each camshaft 43,44 Different timing belt pulleys 45,46.Each timing belt pulley 45,46 is by (omitting diagram) such as Timing Belts It is linked to bent axle 1a and is driven by bent axle 1a.When electromotor 1 operates, the revolving force of bent axle 1a is by same Step band etc. and each timing belt pulley 45,46 and be passed to each camshaft 43,44.Thus, inlet valve 41 Carry out action with exhaust valve 42 and distinguish opening and closing air inlet 2 and air vent 4.Now, inlet valve 41 and aerofluxus Door 42 can with bent axle 1a rotate synchronize, i.e. relative with the up and down motion of the piston 47 being linked to bent axle 1a That answer, the induction stroke of electromotor 1, compression stroke, outburst expansion stroke and exhaust stroke are synchronously Action is carried out on the opportunity of regulation.In the present embodiment, camshaft 43,44 and timing belt pulley are utilized 45, the valve actuating gear of the 46 composition present invention.

In the present embodiment, as it is shown in figure 1, be provided with cam angle sensing on the camshaft 43 of air inlet side Device 56.This cam angle sensor 56 detects the anglec of rotation of camshaft 43.Timing belt pulley 45 in air inlet side It is provided with DYN dynamic variable valve timing mechanism (hereinafter referred to as " VVT ".)61.This VVT61 structure Become the opening and closing moment (valve timing) of the closing characteristic that can change as inlet valve 41.That is, VVT61 Drive by being attached motor (omitting diagram), it is possible to make the valve timing of inlet valve 41 in regulation Before wide-ultra and postpone.Thus, it is configured to change the air valve between inlet valve 41 and exhaust valve 42 Overlapping.In the present embodiment, VVT61 is equivalent to the example of closing characteristic changeable mechanism of the present invention.

VVT61 comprise between ring gear between the camshaft 43 of air inlet side and timing belt pulley 45 and Helical spline (each omits diagram).And, VVT61 makes ring by making motor carry out action Shape pinion rotation and slip, change the rotatable phase between camshaft 43 and timing belt pulley 45.Due to It is known that therefore the structure of the VVT61 including this ring gear etc., omits detailed at this Explanation.

Here, to utilizing the valve overlap between VVT61 change inlet valve 41 and exhaust valve 42 to say Bright.(b) of (a) of Fig. 3, Fig. 3 utilize schematic diagram to represent between inlet valve 41 and exhaust valve 42 Valve overlap.Valve overlap be meant that in shuttle electromotor air inlet and air vent are beaten simultaneously The state opened.Generally, inlet valve is utilized to open air inlet at the end of the exhaust stroke of 4 Stroke Engine, Purpose for the charging efficiency improving air inlet sets valve overlap.If widely obtaining valve overlap, then The substantial compression of electromotor is than declining, therefore, it is possible to prevent the abnormal combustions such as detonation.On the contrary, if narrower Ground obtains valve overlap, then the charging efficiency of the gaseous mixture in the low rotary area of electromotor raises, even if It is the low rotation of underload, it is also possible in gaseous mixture, obtain stable burning.Additionally, except electromotor Output facet outside, by utilizing valve overlap, it is possible to when carrying out internal EGR within the engine, remove Outside purification aerofluxus, it is possible to reduce pumping loss etc., it helps improve propellant flow rate.According to sending out The rotary speed of motivation, load etc., the suitable opportunity carrying out internal EGR is different, but utilizes VVT Valve overlap can be implemented on optimal opportunity.

In FIG, the rotatable phase of the camshaft 43 of air inlet side is made to lead by making VVT61 carry out action Prior to the rotatable phase of timing belt pulley 45, the phase place of the valve timing of inlet valve 41 is relative to bent axle 1a's Rotatable phase is advanced.In this case, as shown in (b) of Fig. 3, the valve timing phase of inlet valve 41 Advanced over the ground, the valve overlap between inlet valve 41 and exhaust valve 42 in induction stroke relatively becomes big. Now, by utilizing VVT61 to make the valve timing of inlet valve 41 the most in advance, valve overlap becomes maximum. In contrast, make the rotatable phase of the camshaft 43 of air inlet side lag behind by making VVT61 carry out action The rotatable phase of timing belt pulley 45, the rotation relative to bent axle 1a of the phase place of the valve timing of inlet valve 41 Phase delay.In this case, as shown in (a) of Fig. 3, the valve timing of inlet valve 41 is relatively Postponing, the valve overlap in induction stroke relatively diminishes.Now, by utilizing VVT61 to make inlet valve The valve timing of 41 postpones the most, and valve overlap becomes minimum and (disappears.).

In the present embodiment, being provided with blow-by gas returning apparatus on electromotor 1, this alters cylinder mixing Gas return mechanism utilize in intake channel 3 produce negative pressure make spontaneous combustion room 16 escape to crankcase 1b, The blow-by gas of the inside of cylinder head (comprising skull) 1c is back to combustor 16.As it is shown in figure 1, Blow-by gas returning apparatus includes blow-by gas return path 66, Pcv valve 67, scavenging path 68. Blow-by gas return path 66 is back to combustor to make the blow-by gas produced in electromotor 1 16 and make this blow-by gas flow into intake channel 3.The entrance side of blow-by gas return path 66 via Pcv valve 67 is connected to cylinder head 1c, and the outlet side of this blow-by gas return path 66 is connected to pressurizer tank 3a.Pcv valve 67 be configured to the blow-by gas flow in order to adjust in blow-by gas return path 66 and Action is carried out by negative pressure.Here, when electromotor 1 operates and when being supercharger 7 inoperative, pressurizer tank Becoming negative pressure in 3a, this negative pressure acts on cylinder head via blow-by gas return path 66 and Pcv valve 67 The inside of 1c.Pcv valve 67 is carried out valve opening action by this negative pressure, and blow-by gas is from cylinder head 1c Pressurizer tank 3a is flowed into via Pcv valve 67 and blow-by gas return path 66.The entrance side of scavenging path 68 Be connected to intake channel 3 by the part near air filter 6, the outlet side of this scavenging path 68 connects In cylinder head 1c (skull).When blow-by gas flows into pressurizer tank 3a from cylinder head 1c, scavenging path 68 import new gas to the inside of cylinder head 1c and its inside are carried out scavenging.

Fig. 4 utilize sectional view represent Pcv valve 67.As shown in Figure 4, Pcv valve 67 includes the main body of tubulose 71, it is formed with pipe joint 72 at its one end, is formed with external screw thread 73 in its other end.At pipe joint Connecting on 72 has blow-by gas return path 66, external screw thread 73 to be connected to cylinder head 1c.It is being formed at master On the path 74 of the inside of body 71, it is equipped with the valve of the most reciprocating substantially bullet shape Core 75.Spool 75 is formed with needle-like portion 75a of the thin shape in top in its tip side, and needle-like portion 75a is with breakthrough form The mode becoming the poroid measurement unit 76 on the path 74 of main body 71 configures.Additionally, spool 75 is set Expand to the gap (aperture of spool 75) between needle-like portion 75a and measurement unit 76 at spring 77 about Big direction, i.e. valve opening direction exert a force.And, by the leading to main body 71 from the side of pipe joint 72 Road 74 acts on the negative pressure produced in pressurizer tank 3a, utilizes this negative pressure, the internal pressure of cylinder head 1c, bullet Balance between the force of spring 77 determines the shift position of spool 75, and determines the aperture of spool 75.Utilize This aperture regulates the blow-by gas flow derived from cylinder head 1c to pressurizer tank 3a.

Fig. 5 utilize graph representation electromotor 1 slow down and the discharge characteristic of Pcv valve 67 during fuel cut-off. In this chart, transverse axis represents that pressurizer tank 3a's acts on Pcv valve by blow-by gas return path 66 The negative pressure of the admission pressure PM of 67, the longitudinal axis represents the flow of the blow-by gas of flowing in Pcv valve 67 (PCV flow).Can be clear and definite according to this chart, along with admission pressure PM increases to " air from " negative pressure is big " Pressure ", PCV flow increases to maximum stream flow m4 from a certain low discharge m1, reduces towards zero afterwards.Thus, At PCV flow from the period that minimum discharge m1 reaches maximum stream flow m4, when EGR valve 18 is closed, Admission pressure PM becomes the 1st value p1, in the case of PCV flow becomes the 2nd flow m2, passes through EGR Valve 18 is opened, thus admission pressure PM becomes the 2nd value p2 (＞ p1), and PCV flow becomes the 3rd value m3 (＞ m2).That is, this Pcv valve 67 has such discharge characteristic: slow down and fuel cut-off at electromotor 1 Time, EGR valve 18 is opened from valve closed mode, so that PCV flow increases.

In the present embodiment, in order to according to the operating condition of electromotor 1 perform respectively fuel injection control, Ignition timing controls, air inflow control, EGR control and valve timing control etc., according to electromotor 1 Operating condition utilize electronic-controlled installation (ECU) 50 control respectively fuel injector 25, lighter 30, The stepping motor 22 of electronic throttle device 14, the DC motor 31 and VVT61 of EGR valve 18. ECU50 includes: central processor (CPU)；Various memorizeies, it is previously stored with the control of regulation Processing procedure sequence etc., or temporarily store the operation result etc. of CPU；And outside input circuit and outside export Loop, they are connected with central processor (CPU), various memorizer.ECU50 is equivalent to this One example of bright fault verification parts.Outside output loop connects have lighter 30, fuel injector 25, Stepping motor 22, DC motor 31 and VVT61 etc..Outside input circuit connects and has solar term Headed by sensor 23 for detect electromotor 1 operating condition various sensors 23,27,28,51～ 56, and input for various engine signals.

Here, as various sensors, in addition to solar term sensor 23 and cam angle sensor 56, be provided with Acceleration sensor 27, air inlet pressure sensor 51, rotation speed sensor 52, cooling-water temperature sensor 53, sky Air-flow gauge 54 and air-fuel ratio sensor 55.Acceleration sensor 27 is for detecting as accelerator pedal 26 Acceleration aperture ACC of operational ton.Accelerator pedal 26 is in order to regulate the output of electromotor 1 and by human pilot Operate.Air inlet pressure sensor 51 is equivalent to an example of the admission pressure detection part of the present invention, Originally be the admission pressure PM in detection pressurizer tank 3a and one of operating condition as expression electromotor 1 Individual key element.Rotation speed sensor 52 detect the bent axle 1a of electromotor 1 the anglec of rotation (crank angle) and And detect the change of this crank angle and as rotary speed (engine rotary speed) NE of electromotor 1. Cooling-water temperature sensor 53 detects the coolant water temperature THW of electromotor 1.Mass air flow sensor 54 is equivalent to the present invention's One example of air inflow detection part, be originally detect intake channel 3 by air filter 6 just under In the part of trip flowing air inflow Ga and as the key element of operating condition of expression electromotor 1.Empty The part of the positive upstream by catalytic converter 15 of exhaust channel 5 is located in combustion than sensor 55, detects aerofluxus In air-fuel ratio A/F.

In the present embodiment, for operating shape according to electromotor 1 in the full operation range of electromotor 1 State controls EGR, ECU50 and controls EGR valve 18.Additionally, ECU50 is generally according to the acceleration of electromotor 1 The operating condition detected during operating or during steady running controls EGR valve 18 makes it open, at electromotor 1 stop time, idle running time or slow down operating time control EGR valve 18 make it close.

In the present embodiment, in order to make electromotor 1 operate according to the requirement of driver, ECU50 according to Accelerate aperture ACC and control electronic throttle device 14.Additionally, when the accelerated service of electromotor 1 or steady When surely operating, ECU50 makes it open according to accelerating aperture ACC control electronic throttle device 14, is starting During the stopping of machine 1 or slow down operating time, ECU50 controls electronic throttle device 14 makes it close.Thus, Air throttle 21 is opened, when the stopping of electromotor 1 when the accelerated service of electromotor 1 or during steady running Or slow down and close when operating.Here, when the deceleration of electromotor 1 operates, air throttle 21 is fixed on and connects The most fully closed, can be somewhat for the state (transonic condition (sonic of small aperture of regulation of inlet flow condition))。

Here, the blow-by gas returning apparatus of present embodiment is also required to suitably carry out blow-by gas Return.Therefore, in the present embodiment, ECU50 performs following such fault detect process.

Fig. 6 utilizes an example of the process content of flowchart representation fault detect.It is transformed into this example in process Cheng Shi, first, in step 100, ECU50 judge the operating condition of electromotor 1 whether be in deceleration and During fuel cut-off.That is, it is judged that whether whether electromotor 1 be in when deceleration operates and block Fuel injector 25 is utilized to supply fuel to electromotor 1.As described above, when the deceleration of electromotor 1 operates, The air throttle 21 and the EGR valve 18 that control electronic throttle device 14 respectively make them close.Now, EGR valve 18 become fully closed, and air throttle 21 is maintained at somewhat can be for the state of the small aperture of the regulation of inlet flow (transonic condition).ECU50 can carry out above-mentioned judgement according to the change accelerating aperture ACC.Sentence at this In the case of disconnected result is for negative, process is transformed into step 260 by ECU50.It is willing in this judged result In the case of Ding, process is transformed into step 110 by ECU50.

In step 110, whether ECU50 failure judgement marker for determination Xegrpcvobd is " 0 ".Here, In the case of EGR valve 18 and Pcv valve 67 have been carried out fault verification, failure determination flag Xegrpcvobd is set to " 1 ", is not carrying out the situation of fault verification, failure determination flag Xegrpcvobd is set to " 0 ".In the case of this judged result is for negative, process is returned by ECU50 Return step 100.In the case of this judged result is for affirmative, process is transformed into step 120 by ECU50.

In the step 120, ECU50 obtains air inflow Ga according to the detected value of mass air flow sensor 54.

Then, in step 130, ECU50 judges that EGR closes whether labelling Xegroff is " 0 ".At picture In the case of the aftermentioned EGR obtained when EGR valve 18 is closed closes air inflow Gaoff, EGR closes Close labelling Xegroff and be set to " 1 ", in the case of not obtaining this EGR closedown air inflow Gaoff, EGR closes labelling Xegroff and is set to " 0 ".In the case of this judged result is for negative, ECU50 Process is transformed into step 160.In the case of this judged result is for affirmative, process is changed by ECU50 To step 140.

In step 140, air inflow Ga obtained in the step 120 is closed by ECU50 as EGR valve 18 Time EGR close air inflow Gaoff store in memory.Additionally, in step 150, ECU50 will EGR closes labelling Xegroff and is set as " 1 ".Afterwards, ECU50 the process returns to step 130.

On the other hand, changing from step 130, in a step 160, ECU50 controls EGR valve 18 makes its dozen Open regulation aperture B1.Thereby, it is possible to the EGR valve 18 having temporarily become full-shut position is opened forcibly.

Then, in step 170, ECU50 waits for the stipulated time and is transformed into step 180.Here, Stipulated time can be set to such as " 1 second ".

In step 180, ECU50 obtains air inflow Ga according to the detected value of mass air flow sensor 54, should EGR when air inflow Ga obtained opens as EGR valve 18 opens air inflow Gaon and is stored in storage In device.

Then, in step 190, ECU50 judges that EGR opens air inflow Gaon and EGR closes air inlet Whether the difference of amount Gaoff is more than setting C1.That is, ECU50 judges air inlet when EGR valve 18 opens The difference of air inflow Ga when amount Ga and EGR valve 18 close is the biggest to a certain extent.Tie in this judgement In the case of fruit is for affirmative, process is transformed into step 200 by ECU50.It is negative in this judged result In the case of, process is transformed into step 220 by ECU50.

In step 200, ECU50 judges that EGR valve 18 is normal.Here, ECU50 can be normal by this The fact storage in memory.

Then, in step 210, ECU50 judges that Pcv valve 67 is normal, and process is transformed into step 230. Here, ECU50 is by this normal true storage in memory.

On the other hand, in a step 220, ECU50 make EGR valve 18 occur in a valve-closed state therefore The barrier judgement of (valve closing fault) or Pcv valve 67 break down under set state (set fault, Refer to the set because moisture freezes in a valve-closed state, oil content solidification and that sets etc. cause therefore Barrier) judgement, process is transformed into step 230.Here, ECU50 can inform EGR to driver The fact that the judgement of valve closing fault or Pcv valve set fault verification, or EGR valve closing fault is sentenced Storage is in memory for the fact that fixed or Pcv valve set fault verification.

Then, in step 230, EGR is closed labelling Xegroff and resets to " 0 " by ECU50.Additionally, In step 240, failure determination flag Xegrpcvobd is set as " 1 " by ECU50.

Then, in step 250, ECU50 terminates the valve of EGR valve 18 is opened control, process is returned Return step 100.

On the other hand, changing from step 100, in step 260, EGR is closed labelling Xegroff by ECU50 Reset to " 0 ".

Then, in step 270, ECU50 judges whether Pcv valve 67 or EGR valve 18 are examined from fault Survey and recover.In the case of this judged result is for negative, ECU50 the process returns to step 100.At this In the case of judged result is for affirmative, process is transformed into step 280 by ECU50.

Then, in step 280, ECU50 stops the valve of EGR valve 18 is opened control, process is returned Return step 100.

Using above-mentioned control, ECU50 is in the deceleration of electromotor 1 and by electronic throttle device during fuel cut-off The air throttle 21 of 14 is fixed as the small aperture of regulation, controls EGR valve 18 and makes it force from valve closed mode Open, make the negative pressure of the admission pressure PM in pressurizer tank 3a change, according to making this negative pressure send out The change of air inflow Ga detected by mass air flow sensor 54 before and after changing judges Pcv valve 67 It is whether set fault or whether EGR valve 18 is valve closing fault.

As described above, the failure detector of present embodiment is used, subtracting of electromotor 1 Speed and during fuel cut-off, the admission pressure PM in pressurizer tank 3a becomes negative pressure.Thus, in Pcv valve 67 In the case of Zheng Chang, Pcv valve 67 is carried out action by this negative pressure, adjusts according to the size of this negative pressure and alters cylinder Blow-by gas flow in gaseous mixture return path 66, makes pressurizer tank 3a according to this blow-by gas flow In air inflow PM change.In contrast, in the case of Pcv valve 67 breaks down, even if Negative pressure in pressurizer tank 3a changes, and blow-by gas flow also cannot obtain the change of anticipation, air inlet Air inflow Ga in path 3 cannot obtain the change of anticipation.

Here, in the deceleration of electromotor 1 and during fuel cut-off, utilize ECU50 by electronic throttle device 14 Air throttle 21 be fixed as regulation small aperture, control EGR valve 18 make it from valve closed mode forcibly Opening, the negative pressure of the admission pressure PM in pressurizer tank 3a changes.And, utilize ECU50 according to The change of air inflow Ga detected by mass air flow sensor 54 before and after this negative pressure changes is sentenced Determine whether Pcv valve 67 is set fault.That is, deposit in varying situations in air inflow Ga, Pcv valve 67 Action can be carried out, it is possible to judge that Pcv valve 67 is normal as envisioning according to the change picture of negative pressure.The opposing party Face, in the case of air inflow Ga is not changed in, Pcv valve 67 changing as anticipation not according to negative pressure Carry out action like that, it is possible to judge that Pcv valve 67 is as set fault.Here, be used for detecting expression electromotor The mass air flow sensor 54 of air inflow Ga of the operating condition of 1 is used for judging the set fault of Pcv valve 67, Therefore, it is not necessary to arrange the sensor being exclusively used in detection fault.Additionally, due to will be in order to regulate EGR gas Flow and be located at the EGR valve 18 of electromotor 1 and be also used as changing the parts of admission pressure PM, therefore, it is not necessary to Special equipment is set.Therefore, do not increase the special-purpose member of fault detect, do not cause the large-scale of device Change and cost increase just can detect the set fault of Pcv valve 67 effectively.

2nd embodiment

Then, blow-by gas returning apparatus by the electromotor of the present invention is explained in detail with reference to the accompanying drawings The 2nd embodiment that failure detector embodies.

It addition, in following each embodiment, to the structural detail equal with above-mentioned 1st embodiment Mark identical reference and omit the description, illustrating centered by difference.

In the present embodiment, on this point of the process content of fault detect with the 1st embodiment Structure is different.Fig. 7 utilizes the process content of the fault detect of flowchart representation present embodiment An example.In the flow chart of figure 7, set between step 120 and step 130 in the fig. 6 flow diagram The process of 125 in steps, is provided with the process of step 145, in step 180 between step 140 and step 150 And be provided with between step 230 on these aspects of process of step 185, step 300～step 360 and the stream of Fig. 6 Journey figure is different.

That is, when process being transformed into this routine, after performing the process of step 100～step 120, ECU50 detected value according to air inlet pressure sensor 51 in step 125 obtains admission pressure PM.

Afterwards, after performing the process of step 130 and step 140, ECU50 will in step 145 EGR when this admission pressure PM obtained closes as EGR valve 18 closes admission pressure PMoff Storage is in memory.

Afterwards, after performing the process of step 150～step 180, ECU50 is root in step 185 Obtain admission pressure PM according to the detected value of air inlet pressure sensor 51, the admission pressure PM of this acquisition is made EGR when opening for EGR valve 18 opens admission pressure PMon and stores in memory.

Then, in step 300, ECU50 judge EGR open admission pressure PMon and EGR close into Whether the difference of atmospheric pressure PMoff is more than setting D1.That is, ECU50 judges when opening EGR valve 18 The difference of admission pressure PM and admission pressure PM when closing EGR valve 18 is the biggest the most to a certain extent.? In the case of this judged result is for affirmative, process is transformed into step 310 by ECU50.In this judged result In the case of negative, process is transformed into step 350 by ECU50.

In the step 310, ECU50 makes EGR valve 18 and judges normally.Here, ECU50 can be by This normal true record is in memory.

Then, in step 320, ECU50 judges that EGR opens air inflow Gaon and EGR closes air inlet Whether the difference of amount Gaoff is more than setting C1.That is, ECU50 judges air inlet when EGR valve 18 opens The difference of air inflow Ga when amount Ga and EGR valve 18 close is the biggest to a certain extent.Tie in this judgement In the case of fruit is for affirmative, process is transformed into step 330 by ECU50.It is negative in this judged result In the case of, process is transformed into step 340 by ECU50.

In a step 330, ECU50 judges that Pcv valve 67 is normal, and process is transformed into step 230.Here, ECU50 can by this normal true record in memory.

Additionally, in step 340, ECU50 makes Pcv valve 67 and the judgement of set fault occurs, at general Reason is transformed into step 230.Here, ECU50 can inform Pcv valve set fault verification to driver True or will record is in memory for the fact that Pcv valve set fault verification.

On the other hand, changing from step 300, in step 350, ECU50 makes EGR valve 18 and valve occurs The judgement of closing fault.Here, ECU50 can inform, to driver, the thing that EGR valve closing fault judges Record is in memory for the fact that in fact or EGR valve closing fault judged.

Then, in step 360, ECU50 retains the normal fault verification of Pcv valve 67, process is turned Change to step 230.

Use above-mentioned control, and when the deceleration fuel cut-off of electromotor 1, ECU50 is by solid for air throttle 21 It is set to the small aperture of regulation, controls EGR valve 18 and make it open forcibly from valve closed mode, make voltage stabilizing The negative pressure of the admission pressure PM in case 3a changes, according to before making this negative pressure change and it After the change of admission pressure PM that detected by air inlet pressure sensor 51 to judge EGR valve 18 whether as Valve closing fault.And, when ECU50 judges that EGR valve 18 is normal, according to making entering of pressurizer tank 3a Air inflow Ga that the negative pressure of atmospheric pressure PM is detected by mass air flow sensor 54 before and after changing Change judges that Pcv valve 67 is whether as set fault.

As described above, the failure detector of present embodiment is used, due to as judgement The premise of the set fault of Pcv valve 67 judge EGR valve 18 whether as valve closing fault, thus, it is also possible to The valve closing fault of detection EGR valve 18.Additionally, in the case of EGR valve 18 is normal, by controlling EGR Valve 18 makes it open forcibly from valve closed mode, that of admission pressure PM picture in pressurizer tank 3a anticipation Sample changes.Here, when utilizing ECU50 to judge that EGR valve 18 is normally, according at admission pressure PM Negative pressure change before and after the change of air inflow Ga that detected by mass air flow sensor 54 judge Whether Pcv valve 67 is set fault.Thus, due to premised on EGR valve 18 is normal, i.e. with air inlet pressure The set fault of Pcv valve 67 is judged premised on changing as the anticipation of power PM picture, accordingly, it is capable to Enough this fault is carried out suitable judgement.Therefore, in addition to the effect of the 1st embodiment, it is possible to suitably Ground carries out fault detect to Pcv valve 67.

3rd embodiment

Then, blow-by gas returning apparatus by the electromotor of the present invention is explained in detail with reference to the accompanying drawings The 3rd embodiment that failure detector embodies.

In the present embodiment, VVT61 is equivalent to the example of another admission pressure change parts of the present invention Son.That is, action is carried out by VVT61 and valve overlap between inlet valve 41 and exhaust valve 42 expands, The admission pressure PM in pressurizer tank 3a can be changed.

Additionally, in the present embodiment, on this point of the process content of fault detect implement with the 2nd The structure of mode is different.Fig. 8 utilizes the place of the fault detect of flowchart representation present embodiment One example of reason content.In the flow chart of figure 8, step 350 in the flow chart of figure 7 and step 330 Between be provided with step 400～the process of step 420, be provided with after step 250 step 430 process, The flow chart with Fig. 7 it is provided with on these aspects of process of step 440 the most not between step 270 and step 280 With.

I.e., in this routine, after the process performing step 350, ECU50 is the most sharp Controlling valve overlap with VVT61 makes it expand.That is, ECU50, by controlling VVT61, makes inlet valve 41 Valve timing advanced relative to standard timing, expand the valve timing of inlet valve 41 and joining of exhaust valve 42 Valve overlap between gas timing.Utilize this control can relax admission pressure PM's in pressurizer tank 3a Vacuum magnitude.

Then, in step 410, ECU50 obtains air inflow Ga according to the detected value of mass air flow sensor 54, Using air inflow Ga of this acquisition as EGR valve 18 close time EGR close air inflow Gaoff be stored in In memorizer.

Then, at step 420, ECU50 judges that EGR opens air inflow Gaon and EGR closes air inlet Whether the difference of amount Gaoff is more than setting E1.That is, ECU50 judges air inlet when EGR valve 18 opens The difference of air inflow Ga when amount Ga and EGR valve 18 close is the biggest to a certain extent.Tie in this judgement In the case of fruit is for affirmative, process is transformed into step 360 by ECU50.It is negative in this judged result In the case of, process is transformed into step 340 by ECU50.

Additionally, change from step 250, in step 430, ECU50 terminates the gas utilizing VVT61 to carry out The expansion of valve lap controls, and the process returns to step 100.

On the other hand, changing from step 270, in step 440, ECU50 stops to utilize VVT61 to carry out Valve overlap expand control, process is transformed into step 280.

Use above-mentioned control, and when the deceleration fuel cut-off of electromotor 1, ECU50 is by solid for air throttle 21 It is set to the small aperture of regulation, controls EGR valve 18 and make it open forcibly from valve closed mode, make voltage stabilizing The negative pressure of the admission pressure PM in case 3a changes, according to before making this negative pressure change and it After the change of admission pressure PM that detected by air inlet pressure sensor 51 to judge EGR valve 18 whether as Valve closing fault.And, when ECU50 judges that EGR valve 18 is normal, according to making bearing of pressurizer tank 3a The change of air inflow Ga that pressure is detected by mass air flow sensor 54 before and after changing judges Whether Pcv valve 67 is set fault.Additionally, when ECU50 judges EGR valve 18 as valve closing fault, Control VVT61 and make the negative pressure of the admission pressure PM in pressurizer tank 3a change, according to making this bear The change of air inflow Ga that pressure is detected by mass air flow sensor 54 before and after changing judges Whether Pcv valve 67 is set fault.

As described above, the failure detector of present embodiment is used, due to as judgement The premise of the set fault of Pcv valve 67 judge EGR valve 18 whether as valve closing fault, thus, it is also possible to The valve closing fault of detection EGR valve 18.Additionally, in the case of EGR valve 18 is normal, by controlling EGR Valve 18 is opened forcibly from valve closed mode, and the negative pressure of the admission pressure PM in pressurizer tank 3a is as anticipation Change like that.Here, when utilizing ECU50 to judge that EGR valve 18 is normally, according at admission pressure The change of air inflow Ga that the negative pressure of PM is detected by mass air flow sensor 54 before and after changing comes Judge that Pcv valve 67 is whether as set fault.Thus, due to premised on EGR valve 18 is normal, i.e. air inlet The set fault of Pcv valve 67 is judged premised on changing as the anticipation of pressure PM picture, therefore, This fault can be carried out suitable judgement.Therefore, in addition to the effect of the 1st embodiment, it is possible to right Pcv valve 67 carries out suitable fault detect.

On the other hand, in the case of EGR valve 18 is valve closing fault, even if controlling EGR valve 18 to make it Opening forcibly from valve closed mode, the negative pressure of the admission pressure PM in pressurizer tank 3a also cannot obtain pre- The change thought.Here, when utilizing ECU50 to judge EGR valve 18 as valve closing fault, utilize VVT61 Control valve overlap to make it expand and make the negative pressure of the admission pressure PM in pressurizer tank 3a change, root Change according to air inflow Ga detected by mass air flow sensor 54 before and after changing in this negative pressure Judge that Pcv valve 67 is whether as set fault.Thus, the situation of valve closing fault is there is in EGR valve 18, Can also ensure that the chance of the fault judging Pcv valve 67.Additionally, due to by for making joining of inlet valve 41 The most variable purpose of gas timing is located at the VVT61 of electromotor 1 and is also used as changing another portion of admission pressure PM Part, therefore, it is not necessary to arrange special equipment.Therefore, the special-purpose member of fault detect is not increased, no Cause maximization and cost increase just can effectively detect the set fault of Pcv valve 67, and can fit Locality carries out this fault detect.It is further possible to the valve closing fault of detection EGR valve 18, in EGR valve In the case of 18 are valve closing fault, it is also possible to more suitably Pcv valve 67 is carried out fault detect.

4th embodiment

Then, blow-by gas returning apparatus by the electromotor of the present invention is explained in detail with reference to the accompanying drawings The 4th embodiment that failure detector embodies.

In the present embodiment, VVT61 is equivalent to the example of admission pressure change parts of the present invention. That is, it is operated by VVT61 and changes the valve overlap between inlet valve 41 and exhaust valve 42, it is possible to Admission pressure PM in change pressurizer tank 3a.

In the present embodiment, on this point of the process content of fault detect with the 2nd embodiment Structure is different.Fig. 9 utilizes the process content of the fault detect of flowchart representation present embodiment An example.In the flowchart of fig. 9, be provided with step 111, step 131, step 141, step 146, Step 151, step 161, step 181, step 186, step 301, step 311, step 321, step The process of rapid 351, step 231, step 241, step 251, step 261 and step 281 carrys out alternate figures Step 110 in the flow chart of 7, step 130, step 140, step 145, step 150, step 160, Step 180, step 185, step 300～step 320, step 350, step 230～step 260 and Step 280 is the most different with the flow chart of Fig. 7.

That is, when process being transformed into this routine, ECU50 after the process of step 100 in step 111 Whether middle failure judgement marker for determination Xvvtpcvobd is " 0 ".Here, to VVT61 and Pcv valve 67 In the case of having carried out fault verification, failure determination flag Xvvtpcvobd is set to " 1 ", is not entering In the case of row fault verification, failure determination flag Xvvtpcvobd is set to " 0 ".Tie in this judgement In the case of fruit is for negative, ECU50 the process returns to step 100.It is the feelings of affirmative in this judged result Under condition, process is transformed into step 120 by ECU50.

Afterwards, after performing the process of step 120 and step 125, in step 131, ECU50 Judge that VVT disconnects whether labelling Xvvtoff is " 0 ".As aftermentioned obtained VVT61 disconnect time In the case of VVT disconnects air inflow Gavoff, VVT disconnects labelling Xvvtoff and is set to " 1 ", is not having Having in the case of obtaining this VVT disconnection air inflow Gavoff, VVT disconnects labelling Xvvtoff and is set to “0”.In the case of this judged result is for negative, process is transformed into step 161 by ECU50.Sentence at this In the case of disconnected result is for affirmative, process is transformed into step 141 by ECU50.

In step 141, air inflow Ga obtained in step 125 is disconnected air inlet as VVT by ECU50 Amount Gavoff stores in memory.Additionally, in step 146, ECU50 will obtain in step 125 Admission pressure PM as VVT disconnect admission pressure PMvoff store in memory.Additionally, in step In rapid 151, VVT is disconnected labelling Xvvtoff and is set as " 1 " by ECU50.Afterwards, process is returned by ECU50 Return step 131.

On the other hand, changing from step 131, in the step 161, ECU50 utilizes VVT61 to control air valve Overlap makes it expand.Thereby, it is possible to the vacuum magnitude of the admission pressure PM relaxed in pressurizer tank 3a.

Then, ECU50 waits for the stipulated time in step 170 and is transformed into step 181, in step In 181, detected value according to mass air flow sensor 54 obtains air inflow Ga, using air inflow Ga of this acquisition as VVT when VVT61 connects connects air inflow Gavon and stores in memory.

Then, in step 186, ECU50 obtains air inlet according to the detected value of air inlet pressure sensor 51 Pressure PM, using the admission pressure PM of this acquisition as VVT61 connected time VVT connect admission pressure PMvon stores in memory.

Then, in step 301, ECU50 judges that VVT connects admission pressure PMvon and VVT and disconnects Whether the difference of admission pressure PMvoff is more than setting D1.That is, ECU50 judges when VVT61 has connected The difference of admission pressure PM and VVT61 admission pressure PM when being disconnected the biggest the most to a certain extent.? In the case of this judged result is for affirmative, process is transformed into step 311 by ECU50.In this judged result In the case of negative, process is transformed into step 351 by ECU50.

In step 311, ECU50 makes VVT61 and judges normally.Here, ECU50 can will be somebody's turn to do Normal true record is in memory.

Then, in step 321, ECU50 judge VVT connect air inflow Gavon and VVT disconnect into Whether the difference of tolerance Gavoff is more than setting C1.That is, ECU50 judges air inlet when VVT61 has connected The difference of air inflow Ga when amount Ga and VVT61 is disconnected is the biggest to a certain extent.In this judged result In the case of affirmative, process is transformed into step 330 by ECU50.In the feelings that this judged result is negative Under condition, process is transformed into step 340 by ECU50.

In a step 330, ECU50 judges that Pcv valve 67 is normal, and process is transformed into step 231.Here, ECU50 can by this normal true record in memory.

Additionally, in step 340, ECU50 makes Pcv valve 67 and the judgement of set fault occurs, at general Reason is transformed into step 231.Here, ECU50 can inform Pcv valve set fault verification to driver True or will record is in memory for the fact that Pcv valve set fault verification.

On the other hand, changing from step 301, in step 351, ECU50 makes VVT61 and breaks down Judgement.Here, ECU50 can be the fact that to driver informs VVT fault verification or by VVT Record is in memory for the fact that fault verification.

Then, in step 360, ECU50 retains the normal fault verification of Pcv valve 67, process is turned Change to step 231.

Then, in step 231, VVT is disconnected labelling Xvvtoff and resets to " 0 " by ECU50.Additionally, In step 241, failure determination flag Xvvtpcvobd is set as " 1 " by ECU50.

Then, in step 251, the valve overlap that ECU50 terminates to utilize VVT61 to carry out expands control, The process returns to step 100.

On the other hand, changing from step 100, in step 261, VVT is disconnected labelling Xvvtoff by ECU50 Reset to " 0 ".

Additionally, change from step 270, in step 281, ECU50 stops the gas utilizing VVT61 to carry out Valve lap expands and controls, and the process returns to step 100.

Use above-mentioned control, and when the deceleration fuel cut-off of electromotor 1, ECU50 is by solid for air throttle 21 It is set to the small aperture of regulation, utilizes VVT61 to control valve overlap and make it expand, make in pressurizer tank 3a The negative pressure of admission pressure PM changes, according to before and after making this negative pressure change by air inlet The change of the admission pressure PM that pressure transducer 51 detects is to judge that VVT61 is as fault.And, ECU50 judges, when VVT61 is normal, to become according to the negative pressure at the admission pressure PM making pressurizer tank 3a The change of air inflow Ga detected by mass air flow sensor 54 before and after change is to judge that Pcv valve 67 is No for set fault.

As described above, the failure detector of present embodiment is used, due to as judgement The premise of the set fault of Pcv valve 67 judge VVT61 whether as fault, thus, it is also possible to detection The fault of VVT61.Additionally, in the case of VVT61 is normal, by utilizing VVT61 to control air valve weight Folding makes it expand, and changes as the admission pressure PM picture anticipation in pressurizer tank 3a.Here, Utilize ECU50 judge VVT61 normal time, before changing according to the negative pressure at admission pressure PM and The change of air inflow Ga detected by mass air flow sensor 54 afterwards is to judge that whether Pcv valve 67 is as set Fault.Thus, owing to premised on VVT61 is normal, i.e. occurring as the anticipation of admission pressure PM picture It is changed to premise to judge the set fault of Pcv valve 67, therefore, it is possible to this fault is carried out suitable sentencing Fixed.Therefore, in addition to the effect of the 1st embodiment, it is possible to suitably Pcv valve 67 is carried out fault inspection Survey.

5th embodiment

Then, blow-by gas returning apparatus by the electromotor of the present invention is explained in detail with reference to the accompanying drawings The 5th embodiment that failure detector embodies.

In the present embodiment, with above-mentioned on these aspects of process content of engine system and fault detect The structure of each embodiment is different.Figure 10 utilize summary construction diagram represent the gasoline of present embodiment Engine system.As shown in Figure 10, in the present embodiment, it is being additionally provided with for importing to pressurizer tank 3a The new conductance of new gas enters path 81, for adjusting the new conductance of the new gas of flowing in new conductance enters path 81 Enter on this point of valve 82 different with the gasoline engine system of Fig. 1.New conductance enters the entrance of path 81 81a is connected to the outlet 17a part by the upstream of the ratio EGR passage 17 of intake channel 3, and new conductance enters logical The outlet 81b on road 81 is connected to the ratio air throttle 21 of intake channel 3 downstream and more top trip than pressurizer tank 3a Part.It is electrodynamic valve that new conductance enters valve 82, and it is in order to regulate the new of in new conductance enters path 81 flowing Gas and controlled by ECU50.

Additionally, the engine system of present embodiment include low pressure recycle formula EGR device to substitute above-mentioned respectively The cycle of higher pressure formula EGR device of embodiment.I.e., in the present embodiment, as shown in Figure 10, EGR The entrance 17b of path 17 is connected to the ratio catalytic converter 15 of exhaust channel 5 part downstream, and EGR leads to The outlet 17a on road 17 is connected to ratio compressor 8 part by the upstream of intake channel 3.In EGR passage 17 On be respectively equipped with cooler for recycled exhaust gas 20 and EGR valve 18.

In the present embodiment, new conductance enter that valve 82 is equivalent to the admission pressure change parts of the present invention one Example.That is, enter valve 82 by new conductance and carry out action, it is possible to the admission pressure PM in change pressurizer tank 3a Negative pressure.Additionally, in the present embodiment, VVT61 is equivalent to another admission pressure change of the present invention One example of parts.That is, carry out action by VVT61 and make the gas between inlet valve 41 and exhaust valve 42 Valve lap expands, it is possible to the negative pressure of the admission pressure PM in change pressurizer tank 3a.

Figure 11 utilizes an example of the process content of the fault detect of flowchart representation present embodiment. When process is transformed into this routine, first, in step 500, ECU50 judges the operating of electromotor 1 State whether be in deceleration and during fuel cut-off.In the case of this judged result is for negative, Process is transformed into step 740 by ECU50.In the case of this judged result is for affirming, at ECU50 general Reason is transformed into step 510.

In step 510, whether ECU50 failure judgement marker for determination Xacvpcvobd is " 0 ".Here, In the case of new conductance being entered valve 82 and Pcv valve 67 has carried out fault verification, failure determination flag Xacvpcvobd is set to " 1 ", in the case of not carrying out fault verification, failure determination flag Xacvpcvobd is set to " 0 ".In the case of this judged result is for negative, process is returned by ECU50 Return step 500.In the case of this judged result is for affirmative, process is transformed into step 520 by ECU50.

In step 520, ECU50 obtains air inflow Ga according to the detected value of mass air flow sensor 54.

Then, in step 530, ECU50 judges that new QI GUAN closes whether labelling Xacvoff is " 0 ".At picture Aftermentioned obtain new conductance and entered in the case of new QI GUAN when valve 82 cuts out closes air inflow Gaaoff, newly QI GUAN is closed labelling Xacvoff and is set to " 1 ", is not obtaining this new QI GUAN and close the feelings of air inflow Gaaoff Under condition, new QI GUAN is closed labelling Xacvoff and is set to " 0 ".In the case of this judged result is for negative, Process is transformed into step 560 by ECU50.In the case of this judged result is for affirming, at ECU50 general Reason is transformed into step 540.

In step 540, air inflow Ga obtained in step 520 is entered valve 82 as new conductance by ECU50 New QI GUAN when closing is closed air inflow Gaaoff and is stored in memory.Additionally, in step 550, New QI GUAN is closed labelling Xacvoff and is set as " 1 " by ECU50.Afterwards, ECU50 the process returns to step 530.

On the other hand, changing from step 530, in step 560, the new conductance of ECU50 control enters valve 82 to be made It opens regulation aperture K1.Thus, the new conductance of valve closed mode enters valve 82 and is opened, it is possible to relax steady The negative pressure of the admission pressure PM of pressure case 3a.

Then, in step 570, ECU50 waits for the stipulated time and is transformed into step 580.Here, Stipulated time can be set to such as " 1 second ".

In step 580, ECU50 obtains air inflow Ga according to the detected value of mass air flow sensor 54, should Air inflow Ga obtained enters new gas when valve 82 opens as new conductance and opens air inflow Gaaon and be stored in In memorizer.

Then, in step 590, ECU50 judges that new gas opens air inflow Gaaon and new QI GUAN closes air inlet Whether the difference of amount Gaaoff is more than setting C1.That is, ECU50 judges that new conductance enters when valve 82 opens The difference that air inflow Ga and new conductance enter air inflow Ga when valve 82 closes is the biggest to a certain extent.? In the case of this judged result is for affirmative, process is transformed into step 600 by ECU50.In this judged result In the case of negative, process is transformed into step 660 by ECU50.

In step 600, the ECU50 conductance that makes new advances enters valve 82 and judges normally.Here, ECU50 energy Enough by this normal true record in memory.

Then, in step 610, ECU50 makes Pcv valve 67 and judges normally.Here, ECU50 Can by this normal true record in memory.

Then, in step 620, new QI GUAN is closed labelling Xacvoff and is reset to " 0 " by ECU50.Additionally, In act 630, failure determination flag Xacvpcvobd is set as " 1 " by ECU50.

Then, in step 640, ECU50 terminates to enter new conductance the valve of valve 82 and opens control.Additionally, In step 650, the valve overlap that ECU50 terminates to utilize VVT61 to carry out expands control.Afterwards, ECU50 the process returns to step 500.

On the other hand, changing from step 590, in step 660, ECU50 judges that new gas opens air inflow Whether Gaaon and new QI GUAN close the difference of air inflow Gaaoff more than setting C2 (＜ C1).That is, ECU50 Judge that new conductance enters air inflow Ga when valve 82 opens and new conductance enters air inflow when valve 82 closes The difference of Ga is the most slightly larger.In the case of this judged result is for affirmative, process is transformed into step by ECU50 670.In the case of this judged result is for negative, process is transformed into step 690 by ECU50.

In step 670, the ECU50 conductance that makes new advances enters valve 82 and judges normally.Here, ECU50 energy Enough by this normal true record in memory.

Then, in step 680, ECU50 makes the judgement that Pcv valve 67 is set fault.Here, ECU50 can be the fact that to driver informs Pcv valve set fault verification or by Pcv valve set event Record is in memory for the fact that barrier judges.Afterwards, process is transformed into step 620 by ECU50.

Additionally, change from step 660, in step 690, ECU50 make new advances conductance enter valve 82 for valve close Close the judgement of fault.Here, ECU50 to driver inform new conductance enter the fact that valve closing fault judges, Or new conductance enters the fact that valve closing fault judges record in memory.

Then, in step 700, ECU50 utilizes VVT61 control valve overlap to make it expand.Thus, The negative pressure of the admission pressure PM of change pressurizer tank 3a.

Then, in step 720, ECU50 obtains air inflow Ga according to the detected value of mass air flow sensor 54, The new QI GUAN that air inflow Ga of this acquisition enters when valve 82 closes as new conductance is closed air inflow Gaaoff Storage is in memory.

Then, in step 720, ECU50 judges that new gas opens air inflow Gaaon and new QI GUAN closes air inlet Whether the difference of amount Gaaoff is more than setting C3 (＜ C2).That is, ECU50 judges that new conductance enters 82 dozens, valve Air inflow Ga when having opened and new conductance enter whether the difference of air inflow Ga when valve 82 closes has certain journey Degree.In the case of this judged result is for affirmative, process is transformed into step 730 by ECU50.Sentence at this In the case of disconnected result is for negative, ECU50 the process returns to step 680.

In step 730, ECU50 makes Pcv valve 67 and judges normally.Here, ECU50 can be by This normal true record is in memory.Afterwards, process is transformed into step 620 by ECU50.

On the other hand, changing from step 500, in step 740, new QI GUAN is closed labelling Xacvoff by ECU50 Reset to " 0 ".

Then, in step 750, ECU50 judges that whether new conductance enters valve 82 or Pcv valve 67 from event Barrier detection recovers.In the case of this judged result is for negative, ECU50 the process returns to step 500. In the case of this judged result is for affirmative, process is transformed into step 760 by ECU50.

Then, in step 760, the valve overlap that ECU50 stops to utilize VVT61 to carry out expands control. Additionally, in step 770, ECU50 stops to enter new conductance the valve that valve 82 carries out and opens control, will at Reason returns step 100.

Use above-mentioned control, and when the deceleration fuel cut-off of electromotor 1, ECU50 is by solid for air throttle 21 It is set to the small aperture of regulation, controls new conductance and enter valve 82 and make it open forcibly, make in pressurizer tank 3a The negative pressure of admission pressure PM changes, according to before and after making this negative pressure change by air The change of air inflow Ga that effusion meter 54 detects is to judge that whether new conductance enters valve 82 as valve closing fault. And, ECU50 judge new conductance enter valve 82 normal time, according to making the admission pressure PM of pressurizer tank 3a Negative pressure change before and after the change of air inflow Ga that detected by mass air flow sensor 54 sentence Determine whether Pcv valve 67 is set fault.Additionally, judge that new conductance enters valve 82 and closes event as valve at ECU50 During barrier, utilize VVT61 to control valve overlap and make it expand and make the admission pressure PM's in pressurizer tank 3a Negative pressure changes, and detects by mass air flow sensor 54 according to before and after making this negative pressure change The change of air inflow Ga judge that Pcv valve 67 is whether as set fault.

As described above, the failure detector of present embodiment is used, due to as judgement The premise of the set fault of Pcv valve 67 judges that new conductance enters valve 82 whether as valve closing fault, therefore, also New conductance can be detected and enter the valve closing fault of valve 82.Additionally, new conductance enter valve 82 normal in the case of, Entering valve 82 by the new conductance of control makes it open forcibly from valve closed mode, the air inlet pressure in pressurizer tank 3a The negative pressure of power PM changes as anticipation.Here, utilizing ECU50 to judge, new conductance enters valve 82 Time normal, examined by mass air flow sensor 54 before and after changing according to the negative pressure at admission pressure PM The change of air inflow Ga measured is to judge that whether Pcv valve 67 is as set fault.Thus, due to new gas Import valve 82 normal premised on, i.e. admission pressure PM judges premised on changing as anticipation The set fault of Pcv valve 67, therefore, it is possible to carry out suitable judgement to this fault.Accordingly, with respect to The effect of the 1st embodiment, it is possible to more suitably Pcv valve 67 is carried out fault detect.

On the other hand, new conductance enter valve 82 for valve closing fault in the case of, enter even if controlling new conductance Valve 82 makes it open forcibly from valve closed mode, the negative pressure of the admission pressure PM in pressurizer tank 3a also without Method obtains the change of anticipation.Here, utilize ECU50 to judge new conductance enters valve 82 as valve closing fault time, Utilize VVT61 to control valve overlap to make it expand and make the negative pressure of the admission pressure PM in pressurizer tank 3a send out Changing, according to the air inflow detected by mass air flow sensor 54 before and after changing in this negative pressure The change of Ga judges that Pcv valve 67 is whether as set fault.Thus, enter valve 82 in new conductance and occur valve to close In the case of closing fault, it is also possible to guarantee to judge the chance of the fault of Pcv valve 67.Additionally, due to will go out The VVT61 being located at electromotor 1 in the purpose that the valve timing making inlet valve 41 is variable is also used as changing air inlet Another parts of pressure PM, therefore, it is not necessary to arrange special equipment.Therefore, fault detect is not increased Special-purpose member, do not cause and maximize and cost increase just can detect the set of Pcv valve 67 effectively Fault, and can suitably carry out this fault detect.It is further possible to detect new conductance to enter valve 82 Valve closing fault, new conductance enter valve 82 for valve closing fault in the case of, it is also possible to the most right Pcv valve 67 carries out fault detect.

It addition, the present invention is not limited to the respective embodiments described above, it is possible at the model without departing from inventive concept Suitably change a part for structure in enclosing and implement as follows.

(1) in above-mentioned 3rd embodiment and the 5th embodiment, VVT61 has been used as the present invention's Another admission pressure change parts, but also be able to that EGR valve or new conductance are entered valve and be used as the another of the present invention One admission pressure change parts.

(2) in the respective embodiments described above, it is embodied as the failure detector of the present invention including increasing The electromotor 1 of press 7, but also be able to be embodied as not including supercharger by the failure detector of the present invention Electromotor.

(3) in the respective embodiments described above, the failure detector of the present invention is embodied as gasoline to send out Motivational system, but also be able to the present invention is embodied as diesel engine system.

Industrial applicability

The blow-by gas that the present invention can be applied to be arranged on petrol engine, Diesel engine returns The fault detect of device.

Claims

1. a failure detector for the blow-by gas returning apparatus of electromotor, above-mentioned electromotor bag Containing combustor, intake channel, exhaust channel, it is used for the fuel supplying part to above-mentioned combustor supply fuel Part, the air inlet adjustable valve of the air inflow flowed in above-mentioned intake channel for regulation,

Above-mentioned electromotor is provided with detect to detect the operating condition of above-mentioned electromotor above-mentioned enter The air inflow detection of the air inflow of flowing in the ratio above-mentioned air inlet adjustable valve part by the upstream of gas path Parts,

Above-mentioned blow-by gas returning apparatus comprises to make produce in above-mentioned electromotor to alter cylinder mixing The blow-by gas that gas is back to above-mentioned electromotor and makes this blow-by gas flow into above-mentioned intake channel returns Returning path, the outlet of above-mentioned blow-by gas return path is connected to the above-mentioned air inflow of ratio of intake channel and adjusts Joint valve part downstream, above-mentioned failure detector is characterised by,

Above-mentioned electromotor is additionally provided with the ratio above-mentioned air inlet adjustable valve for changing above-mentioned intake channel The admission pressure change parts of the admission pressure in part downstream,

Above-mentioned blow-by gas returning apparatus also comprises to adjust in above-mentioned blow-by gas return path Blow-by gas flow and carried out the Pcv valve of action by negative pressure,

Above-mentioned failure detector includes fault verification parts, above-mentioned electromotor deceleration operate time and be Blocked utilize above-mentioned fuel supplying part part supply above-mentioned fuel time, these fault verification parts are by above-mentioned air inlet Adjustable valve is fixed as the small aperture of regulation, controls above-mentioned admission pressure change parts and makes above-mentioned air inlet Admission pressure in the ratio above-mentioned air inlet adjustable valve of path part downstream changes, according to making The above-mentioned air inlet that this admission pressure is detected by above-mentioned air inflow detection part before and after changing The change of amount judges that above-mentioned Pcv valve is whether as fault.

The fault detect dress of the blow-by gas returning apparatus of electromotor the most according to claim 1 Put, it is characterised in that

Being additionally provided with admission pressure detection part on above-mentioned electromotor, this admission pressure detection part is in order to examine Survey the operating condition of above-mentioned electromotor and detect the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel on the lower Admission pressure in the part of trip,

Above-mentioned electromotor deceleration operate time and be blocked utilize above-mentioned fuel supplying part part supply on When stating fuel, above-mentioned air inlet adjustable valve is fixed as the small aperture of regulation by above-mentioned fault verification parts, Control above-mentioned admission pressure change parts and make the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel on the lower Admission pressure in the part of trip changes, according to before and after making this admission pressure change The change of the above-mentioned admission pressure detected by above-mentioned admission pressure detection part is to judge above-mentioned air inlet pressure Whether power change parts is fault, when judging that above-mentioned admission pressure change parts is normal, according on making State the above-mentioned air inlet detected before and after admission pressure changes by above-mentioned air inflow detection part The change of amount judges that above-mentioned Pcv valve is whether as fault.

The fault detect dress of the blow-by gas returning apparatus of electromotor the most according to claim 2 Put, it is characterised in that

Above-mentioned electromotor is additionally provided with another admission pressure change parts, this another admission pressure changing unit Part is for changing the air inlet pressure in the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel part downstream Power,

When above-mentioned fault verification parts judge above-mentioned admission pressure change parts as fault, control above-mentioned separately One admission pressure change parts and make the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel portion downstream Admission pressure in Fen changes, according to before and after making this admission pressure change by above-mentioned The change of the above-mentioned air inflow that air inflow detection part detects is to judge that whether above-mentioned Pcv valve is as fault.

The fault inspection of the blow-by gas returning apparatus of electromotor the most according to claim 1 and 2 Survey device, it is characterised in that

Above-mentioned electromotor is additionally provided with for making the row discharged from above-mentioned combustor to above-mentioned exhaust channel A part for gas flows into above-mentioned intake channel as exhaust gas recirculation gas and is back to the row of above-mentioned combustor Gas current return circuit, return for regulating the aerofluxus of the flowing of exhaust gas recirculation gas in above-mentioned exhaust gas recirculation path Stream valve,

Above-mentioned admission pressure change parts is above-mentioned exhaust gas reflux valve,

Above-mentioned electromotor deceleration operate time and be blocked utilize above-mentioned fuel supplying part part supply on When stating fuel, above-mentioned fault verification parts make it strong from valve closed mode by controlling above-mentioned exhaust gas reflux valve Open to system, make the air inlet pressure in the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel part downstream Power changes.

Above-mentioned electromotor also comprises and is respectively arranged on above-mentioned combustor and leads to the air inlet of above-mentioned intake channel With lead to the air vent of above-mentioned exhaust channel, for the inlet valve of the above-mentioned air inlet of opening and closing, for opening and closing The rotation of the exhaust valve and above-mentioned electromotor of stating air vent synchronously drives above-mentioned inlet valve and above-mentioned aerofluxus Door and make the valve actuating gear of its opening and closing, at least one made in above-mentioned inlet valve and above-mentioned exhaust valve The closing characteristic changeable mechanism that closing characteristic is variable,

Above-mentioned admission pressure change parts is above-mentioned closing characteristic changeable mechanism,

Above-mentioned electromotor deceleration operate time and be blocked utilize above-mentioned fuel supplying part part supply on When stating fuel, above-mentioned fault verification parts make above-mentioned closing characteristic changeable mechanism carry out action and make above-mentioned opening Close characteristic changing, so that in the part that the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel is downstream Admission pressure changes.

Above-mentioned electromotor is additionally provided with for leaning on to the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel The part in downstream imports the new conductance of new gas and enters path, enters in path to flow in above-mentioned new conductance for regulation The new conductance of new gas enter valve,

Above-mentioned admission pressure change parts is that above-mentioned new conductance enters valve,

Above-mentioned electromotor deceleration operate time and be blocked utilize above-mentioned fuel supplying part part supply on When stating fuel, above-mentioned fault verification parts enter valve by the above-mentioned new conductance of control makes it strong from valve closed mode Open to system, make the air inlet pressure in the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel part downstream Power changes.

The fault detect dress of the blow-by gas returning apparatus of electromotor the most according to claim 3 Put, it is characterised in that

Another admission pressure change parts above-mentioned is above-mentioned closing characteristic changeable mechanism,

Above-mentioned electromotor deceleration operate time and be blocked utilize above-mentioned fuel supplying part part supply on When stating fuel, above-mentioned fault verification parts make it strong from valve closed mode by controlling above-mentioned exhaust gas reflux valve Open to system, make the air inlet pressure in the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel part downstream Power changes, and detects by above-mentioned admission pressure according to before and after making this admission pressure change The change of the above-mentioned admission pressure that parts detect is to judge that above-mentioned exhaust gas reflux valve, whether as fault, is being sentenced When fixed above-mentioned exhaust gas reflux valve is fault, by making above-mentioned closing characteristic changeable mechanism carry out action, make The admission pressure stated in the ratio above-mentioned air inlet adjustable valve of intake channel part downstream changes, root According to before and after making this admission pressure change by above-mentioned air inflow detection part detect upper State the change of air inflow to judge that whether above-mentioned Pcv valve is as fault.

Above-mentioned electromotor is provided with for the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel on the lower The part of trip imports the new conductance of new gas and enters path, enters flowing in path for regulation in above-mentioned new conductance The new conductance of new gas enters valve,

Above-mentioned electromotor deceleration operate time and be blocked utilize above-mentioned fuel supplying part part supply on When stating fuel, above-mentioned fault verification parts enter valve by the above-mentioned new conductance of control makes it strong from valve closed mode Open to system, make the air inlet pressure in the ratio above-mentioned air inlet adjustable valve of above-mentioned intake channel part downstream Power changes, according to before and after making this admission pressure change by above-mentioned air inflow test section The change of the above-mentioned air inflow that part detects is to judge that whether above-mentioned new conductance enters valve as fault, on judging State new conductance and enter valve when being fault, by making above-mentioned closing characteristic changeable mechanism carry out action, make above-mentioned enter Admission pressure in the ratio above-mentioned air inlet adjustable valve of gas path part downstream changes, according to Before and after making this admission pressure change by above-mentioned air inflow detection part detect above-mentioned enter The change of tolerance judges that above-mentioned Pcv valve is whether as fault.